This vulnerability involves an out-of-bounds read in Microsoft 365 Apps for Enterprise, which can be exploited by an unauthorized attacker to execute code locally. The CVSS 3.1 vector indicates the attack requires local access with low complexity and no privileges but does require user interaction. The impact includes high confidentiality, integrity, and availability impacts. Microsoft has published an official fix and manages remediation for this cloud service. The affected version explicitly stated is 16.0.1.

Successful exploitation could allow an attacker to execute arbitrary code locally, potentially leading to full compromise of the affected system's confidentiality, integrity, and availability. However, exploitation requires local access and user interaction. No active exploitation in the wild has been reported.

An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should follow the guidance in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63515 to ensure their environments are updated and protected.